We use these to hold our portable corrals together. They're great because they're easy to use and quick to get off in the case of an emergency. They also allow your corral to have some give.
Our corrals come with enough bungees to put 2 bungees, per panel. If you want more than that (the more you use, the more secure your corral will be) then you can get more right here!
***The bungees can be a bit tight and can be difficult for some to put on. You can stretch them out before you try to put them on and that will make it easier. The tighter the bungee, the tighter and more secure your corral will be.